Manual drive for a motor comprising a rotational member movable axially along a shaft of the drive

ABSTRACT

A manual drive for a motor with an external rotational member coupled to a main shaft of the motor features a transmission rotational member which is movable axially along a shaft about which it rotates, such that the transmission rotational member of the manual drive is movable between a driving position at one location along the shaft where the transmission rotational member is rotatable so as to drive the motor and a braking position at a different location along the shaft where the transmission rotational member is in engagement with a braking member for braking the motor. The shaft features a threaded portion which is arranged to draw the transmission rotational member rotating in the first rotational direction along the shaft towards a first portion of the braking member by threadable engagement with the transmission rotational member for braking the transmission rotational member rotating in the first rotational direction.

The present invention relates to a manual drive for a motor that isparticularly but not exclusively suited for driving the motor whenconventional input to the motor is unavailable, for example a poweroutage condition when the motor is an electric motor drawing its inputfrom a power grid. Such manual drives are arranged to drive the motor soas to operate a load attached to the motor. The manual drive istypically also arranged to provide braking functions so as to brake theload.

SUMMARY OF THE INVENTION

According to one aspect of the invention there is provided a manualdrive for a motor with an external rotational member coupled to a mainshaft of the motor, the manual drive comprising:

a body;

a mounting arrangement defined by the body for mounting adjacent themotor in proximity to the external rotational member thereof;

a shaft supported by the body for rotational movement;

a transmission rotational member carried on the shaft for rotationalmovement about an axis defined by the shaft such that the transmissionrotational member is arranged for operatively coupling to the externalrotational member of the motor where the rotational movement of thetransmission rotational member is operable to drive the motor via itsexternal rotational member;

a driving member carried on the shaft at a location adjacent thetransmission rotational member so as to be arranged for effecting therotational movement of the transmission rotational member in a firstrotational direction by rotational movement of the driving member in thefirst rotational direction;

a braking member arranged for braking rotational movement of thetransmission rotational member;

the transmission rotational member being movable axially along the shaftbetween a driving position at one location along the shaft where thetransmission rotational member is rotatable in cooperation with thedriving member so as to drive the motor and a braking position at adifferent location along the shaft where the transmission rotationalmember is in engagement with the braking member for braking the motor.

In one arrangement the driving member and the braking member aredisposed on opposite sides of the transmission rotational member suchthat the transmission rotational member is movable axially along theshaft therebetween.

In one arrangement the driving member comprises a first projectingelement protruding radially of the shaft that is operable to engage acooperative second projecting element on the transmission rotationalmember that is located at a radially spaced position of the shaft.

In one arrangement the braking member comprises a surface carried by thebody that is arranged to engage a face of the transmission rotationalmember facing axially in a direction along the shaft.

In one arrangement the shaft is threaded and the transmission rotationalmember has a bore receiving the shaft that has an inner surface which isthreaded for threadably engaging the threaded shaft.

Another important independent optional feature is that the shaft isthreaded in a manner so as to be arranged to draw the transmissionrotational member rotating in the first rotational direction along theshaft towards the braking member.

The threading of the shaft thus acts to bias the transmission rotationalmember towards the braking member.

Another important independent optional feature is that the transmissionrotational member in its rotational movement is rotatable relative tothe shaft such that the transmission rotational member and the shaft arerotatable in the first rotational direction at the same or differentspeeds.

Therefore, for example in an over-speed condition where the transmissionrotational member is rotating more quickly than the shaft, the shaftthreading acts to bring the transmission rotational member towards thebraking member so as to slow down the transmission rotational member.

In one arrangement the transmission rotational member includes a ratchetarranged to resist rotational movement of the transmission rotationalmember in an opposite second rotational direction.

In this manner, there is braking provided in both the first and secondrotational directions to provide better speed control and brakingabilities for the manual drive.

In one arrangement the transmission rotational member forms a pulley.

However, the transmission rotational member may also form for example acog with teeth.

Another important independent optional feature is that a free end of theshaft is shaped for cooperation with a socket of a hand drill.

Hand power drills may be battery-operated and thus cordless so as to besuited for operation in a power outage condition. Also, hand powerdrills may provide sufficient power including speed and torque fordriving the manual drive.

As such, in the manual drive the shaft is operated by an external agent,for example a human user, in order to drive the manual drive which inturn drives the motor.

Another important independent optional feature is that there is provideda motor brake release mechanism that is arranged to disable a brake ofthe motor such that the motor is controllable by the manual drive.

For example, where the motor is an electric motor, the brake of themotor may be automatically activated when conventional input to themotor is not being provided. Thus, in order to override the motor so asto operate the manual drive and thereby drive the load through themotor, the motor brake release mechanism cooperates to disable the brakeof the motor whose braking functions are then taken over by the manualdrive.

In one arrangement the motor brake release mechanism comprises an armwith an inclined end which is operable to engage the brake of the motorin a manner whereby the brake is disabled.

For example, the arm forms a plate where the inclined end is inclinedout of a plane of a main portion of the arm.

According to another aspect of the invention there is provided a manualdrive for a motor with an external rotational member coupled to a mainshaft of the motor, the manual drive comprising:

a body;

a mounting arrangement defined by the body for mounting adjacent themotor in proximity to the external rotational member thereof;

a shaft supported by the body for rotational movement;

a transmission rotational member carried on the shaft for rotationalmovement about an axis defined by the shaft such that the transmissionrotational member is arranged for operatively coupling to the externalrotational member of the motor where the rotational movement of thetransmission rotational member is operable to drive the motor via itsexternal rotational member;

a driving member carried on the shaft at a location adjacent thetransmission rotational member so as to be arranged for effecting therotational movement of the transmission rotational member in a firstrotational direction by rotational movement of the driving member in thefirst rotational direction;

a braking member arranged for braking rotational movement of thetransmission rotational member;

the transmission rotational member having a bore receiving the shaftthat has an inner surface which is at least partly threaded;

the shaft having a threaded portion along at least a portion of itsaxial length that is threaded in a manner so as to be arranged to drawthe transmission rotational member rotating in the first rotationaldirection along the shaft towards a first portion of the braking memberby threadable engagement with the transmission rotational member suchthat the first portion of the braking member is operable for braking thetransmission rotational member rotating in the first rotationaldirection;

and a second portion of the braking member arranged for braking thetransmission rotational member rotating in an opposite second rotationaldirection.

In one arrangement the first portion of the braking member comprises asurface carried by the body oriented in a radial plane of the shaft soas to be arranged to engage a face of the transmission rotational memberfacing axially along the shaft.

Another important independent optional feature is that the surface isarranged at a fixed location such that the transmission rotationalmember is movable axially along the shaft towards the fixed surface.

In one arrangement the second portion of the braking member forms aratchet arranged to resist rotational movement of the transmissionrotational member in the second rotational direction.

Another important independent optional feature is that a part of theratchet is unitary with the transmission rotational member so as to berotatable therewith.

In one arrangement the part of the ratchet unitary with the transmissionrotational member includes a face facing axially along the shaft that isarranged to engage the first portion of the braking member when brakingin the first rotational direction.

BRIEF DESCRIPTION OF THE DRAWINGS

One arrangement of the invention will now be described in conjunctionwith the accompanying drawings in which:

FIG. 1 is an isometric view of manual drive according to the presentinvention that is coupled to a motor of a machine.

FIG. 2 is an enlarged isometric view from a similar perspective as thatin FIG. 1 but showing the manual drive of FIG. 1 up close. Somecomponents are omitted in this figure for clarity of illustration.

FIG. 3 is another isometric view of the manual drive of FIG. 1 wheresome components are omitted for clarity of illustration.

FIG. 4 is a cross-sectional view along line 4-4 in FIG. 2 where somecomponents are omitted for clarity of illustration.

In the drawings like characters of reference indicate correspondingparts in the different figures.

DETAILED DESCRIPTION

The accompanying figures show a manual drive 100 which is particularlybut not exclusively designed for use with a motor 1 of a pan carouselmachine manufactured and sold by the Applicant under the tradename VidirPan Carousel. The pan carousel machine provides a storage system withpans or carriers 2 carried in vertically stacked configurations on aconveyor 3 forming a closed loop in a generally vertical plane todeliver at a front access opening 4 of the machine that pan which isrecalled to the access opening by a user.

Typically, the pan carousel machine is driven by a three phase electricmotor which draws power from a local power grid. As such, during a poweroutage of the power grid, the pan carousel machine may not be operablethus impeding the user from accessing items which are stored in the pancarousel machine but not located in the respective pan which is alreadyat the access opening.

Furthermore, the motor 1 includes a brake which is activated in aworking position of the brake when the motor is not driving its load,for example when the motor is in an off state so as to not be drawingpower from the grid.

In the example in this specification, the load of the motor 1 is theconveyor 3 carrying the pans. There are provided gears 5 external to acasing 6 of the motor so as to transfer power from a main shaft 7 ofmotor, which is generally vertically oriented, through the gears 5 tothe conveyor 3 which defines the load of the motor in this example. Theconveyor has an initial drive gear 8 which is directly operativelycoupled to the external motor gears 5.

The motor also includes an external rotational member 9 on an outside ofthe motor casing 6 which is coupled to the main shaft 7 (schematicallyshown) such that the main shaft can be driven by an external auxiliaryinput, for example in the event of a power outage. In the illustratedarrangement, the external rotational member 9 forms a pulley which isoriented in a radial plane of the motor's main shaft 7. As the motor ofthe illustrated arrangement may be operate in both a forward direction(that is, a conventional reference direction) and a reverse direction,the external rotational member is rotatable in both a first rotationaldirection R1 corresponding to the forward direction and an oppositesecond rotational direction R2 corresponding to the reverse direction.It thus will be appreciated that the conveyor 3 of the pan carouselmachine may operate in two opposite directions such that the pan 2selected by the user may traverse a shortest path from its presentlocation to the access opening 4, which may not always result inmovement of the conveyor in the same direction for all such cases.

It will also be appreciated that the pans may not all be equally loaded(with items which are overall stored in the pan carousel machine)thereby resulting in an unbalanced condition of the conveyor where theloading of the conveyor on the motor may induce undesirable rotation ofthe motor's main shaft. As such, the brake of the motor may be activatedwhen the main shaft is stationary so as to hold the main shaft againstloading of the conveyor on same.

Turning now to the manual drive 100 in more detail, the manual drivecomprises a body 110 on which other components of the drive are carriedor supported.

The body includes a mounting portion 112 which defines a mountingarrangement of the drive for mounting adjacent the motor in proximity tothe external rotational member thereof. The mounting portion thus formsa bracket with openings therein for accepting fasteners (not shown) sothat the drive 100 is mountable to a frame 12 of the pan carouselmachine. In the illustrated arrangement, the motor 1 is situated withina periphery of the frame 12 with the external motor gears 5 disposedover a bottom cross-member 12A of the frame. The drive 100 is secured byits mounting arrangement to an upright frame member 12B at a heightgenerally horizontally inline with the external rotational member 9 ofthe motor. The drive is thus arranged at a top of the motor casing 6,and a portion 113A of the bracket locating the openings therein isoriented upright at the upright frame member 12B typically.

A support portion 114 of the body extends from the mounting portion 112in a transverse direction thereto. The support portion 114 includes atop support plate 115A and a bottom support plate 115B extending fromthe portion 113A in generally parallel condition to one another. The topand bottom plates 115A, 115B are interconnected by an elongatedconnecting member 117. For example, as in the illustrated arrangementthe connecting may be a hollow tube which is rigidly attached at itsopposite ends to the top and bottom support plates by threaded fastenerspassing through openings in the top and bottom support plates 115A, 115Band into the connecting member 117.

There is provided an intermediate support plate 119 at a locationbetween the top and bottom support plates 115A, 115B but closer to thetop support plate than the bottom plate. The intermediate support plate119 is affixed to the connecting member so as to be held in fixedposition therealong and extends radially of the connecting member 117 ina direction away from the bracket of the mounting arrangement.

The intermediate support plate 119 includes an opening at a locationfurther from mounting portion 112 than the connecting member 117 throughwhich a shaft 120 passes in generally upright orientation. The shaft 120is supported by the body for rotational movement of the shaft. At theopening in the intermediate support plate there is provided acylindrical shaft housing 130 depending from the support plate 119. Theshaft housing 130 circumferentially encloses a portion of the shaft 120below the intermediate support plate and therefore extends axially alongthe shaft. The shaft housing comprises annular top and bottom end caps132A and 132B to close the housing at its top and bottom ends, and atubular outer enclosure 133 spanning between the end caps. The annularend caps are for example bronze washers. Inside the housing, a bushing135 is provided coaxially of the shaft 120 so as to circumferentiallysurround the shaft. The bushing 135 generates drag on the rotating shaftsuch that the bushing acts to brake rotation of the shaft, as comparedto for example a ball bearing which generates virtually no drag. It isthe bushing 135 which acts to hold the shaft 120 in generally fixedposition along its axis S relative to the intermediate support plate119. Additional fasteners of the type such as nuts 136, 137 may bethreadably received on a free end of the shaft 120 that protrudes beyondthe housing 130 below the intermediate support plate. Adjustment of thenuts 136, 137 determines end play of the shaft 120, for example indirections radially of the shaft. Furthermore, load on the shaft actingtransversely thereof is supported by the bushing 135. The bushing is forexample made of bronze.

Further to the shaft 120, the drive 100 includes a transmissionrotational member 140 which is carried on the shaft for rotationalmovement about an axis S defined by the shaft. The transmissionrotational member, which in the illustrated arrangement forms a pulleywith a generally smooth circumferential groove 142 thereabout, isoperatively coupled by an endless belt 150 to the external rotationalmember 9 of the motor, such that rotational movement of the transmissionrotational member of the drive 100 is operable to drive the motor 1 viaits external rotational member.

A free end of the shaft 120 forms a drive head 122 arranged foroperatively coupling to a drive input, for example a hand of a humanagent or a battery-powered power tool, such that the shaft may be drivenin its rotational movement thereby, and this rotational movement then betransferred to drive the transmission rotational member 140. In theillustrated arrangement, the drive head is shaped for cooperation with asocket of a hand drill 300. Thus, for example, the drive head may be ahex head and the manual drive 100 may be suitably driven by a ½″ 18Vcordless drill with a 2 speed function.

A driving member 124 is provided so as to be carried on the shaftalongside the drive head 122 at a location spaced above the intermediatesupport plate 119. The driving member is thus located adjacent thetransmission rotational member so as to be arranged for effectingrotational movement thereof by rotational movement of the drivingmember. The driving member is particularly designed for effecting therotational movement of the transmission rotational member in the firstrotational direction by rotational movement of the driving member inthis same direction.

In the illustrated arrangement, the driving member comprises a firstprojecting element 125 carried by the shaft in fixed relation theretosuch that the first projecting element is rotatable with the shaft. Thefirst projecting element 125 protrudes radially of the shaft 120 so asto be operable to engage a cooperative second projecting element 126which is supported at a radially spaced position of the shaft on a faceof the transmission rotational member facing axially towards the drivehead. The second projecting element 126 is supported in fixed relationto the transmission rotational member 140 so as to be rotatabletherewith, like the first projecting element with respect to the shaft.

The first projecting element forms a partial spiral 125A wrapping in thefirst rotational direction about the shaft with a free end 125B of thespiral presented with a face facing in the first rotational direction.Thus, it is the free end 125B of the first projecting element that isarranged to engage the second projecting element 126 on the transmissionrotational member.

It will be appreciated that the second projecting element may be unitarywith the transmission rotational member so that they form a single body,or the second projecting element may be a separate component which ismounted on the transmission rotational member.

At an oppositely axially facing end of the transmission rotationalmember there is included a ratchet cog 161 which is arranged tocooperate with a spring-loaded pawl 164 such that rotational movement ofthe transmission rotational member in the second rotational direction isresisted and thereby limited to the first rotational direction. Teeth162A of the cog are thus oriented to project in the second rotationaldirection such that by engagement of the pawl in indentations 162B ofthe cog the transmission rotational member is prevented from rotating inthe second rotational direction. Furthermore, the ratchet cog 161 andpawl 164 are located between the belt-receiving portion of thetransmission rotational member, i.e., the groove 142 in the illustratedarrangement, and the intermediate support plate 119 at a location clearof the path of the drive belt 150.

Thus, a ratchet 160 of the manual drive 100 that is collectively formedby the cog 161 and pawl 164 forms a portion of a braking member 170 ofthe manual drive arranged for braking rotational movement of thetransmission rotational member.

Another portion of the braking member 170 is formed by a surface 119A ofthe intermediate support plate facing axially towards the transmissionrotational member 140 that is thus arranged to engage an immediatelyadjacent face of the transmission rotational member.

In order to render the intermediate support plate's surface 119Aoperable for braking rotational movement the transmission rotationalmember particularly in the first rotational direction, the shaft 120 isat least partly threaded T along a portion thereof which is above theintermediate support plate 119 and a bore 154 of the transmissionrotational member receiving the shaft 120 therethrough, that is acentral cylindrical hollow of the transmission rotational member, isalso threaded so as to threadably engage the shaft in a cooperativemanner. As such, the threading provides control of position of thetransmission rotational member axially along the shaft by relativemovement of the transmission rotational member with respect to theshaft.

More specifically, the shaft is threaded in a manner so as to bearranged to draw the transmission rotational member rotating in thefirst rotational direction downwardly along the shaft towards theintermediate support plate. The threading of the shaft thus acts to biasthe transmission rotational member towards the braking surface 119A whenthere is relative movement of the transmission rotational member withrespect to the shaft in the first rotational direction. Furthermore, itthus will be appreciated that the transmission rotational member and theshaft are rotatable relative to one another such that they are rotatablein a common rotational direction at the same or different speeds.

As such, by contact of the transmission rotational member 140 with thebraking surface 119A of the intermediate support plate rotationalmovement of the transmission rotational member in the first rotationaldirection R1 may be slowed down. Furthermore, in order for thetransmission rotational member to be free to rotate in the firstrotational direction for driving the external rotational member thetransmission rotational member thus is required to be arranged in spacedrelation with respect to the braking surface 119A.

The transmission rotational member 140 is therefore movable axiallyalong the shaft 120 between a driving position at one location along theshaft where the transmission rotational member is rotatable incooperation with the driving member 124 so as to drive the motor 1 and abraking position at a different location along the shaft where thetransmission rotational member is in engagement with the braking surface119A forming a second portion of braking member 170 for braking themotor.

In the driving position of the transmission rotational member, the firstprojecting element 125 is in contact with the second projecting element126 and a bottom face 144 of the ratchet cog 161, which is arranged toengage the braking surface 119A, is spaced from the braking surface.Thus, the rotational movement of the shaft in the first rotationaldirection is transferrable to rotational movement of the transmissionrotational member in the first rotational direction.

In the braking position of the transmission rotational member, the firstand second projecting elements 125, 126 are no longer in engagement withone another and the bottom face 144 of the ratchet cog is in engagementwith the braking surface 119A. The threading is able to draw thetransmission rotational member in tight butting engagement with thebraking surface 119A which is at a fixed location.

Thus, the transmission rotational member 140 is movable by threadableinterconnection with the shaft 120 in directions axially along the shaftbetween the driving member 124 to one side of the transmissionrotational member and the second portion of the braking member 170 onthe opposite side thereof.

Further to the forgoing components of the manual drive 100, the driveincludes a motor brake release mechanism 180 that is arranged to disablethe brake of the motor such that the motor is controllable by the manualdrive. In the illustrated arrangement, the motor brake release mechanismis particularly but not exclusively designed for the motor used in theVidir Pan Carousel.

The motor release mechanism 180 thus comprises an extendable arm 182which is pivotally positionable between a disabling position, where thearm is in position so as to release the typically automatic brake of themotor, and an inactive position, where the arm is free of engagementwith the motor brake. This pivotal positioning of the arm is effected bya rotatable control shaft 184 which is oriented transversely to the armand connected thereto by a spacer plate 186 which locates a base of thearm outwardly of the control shaft. The control shaft 184 passes throughthe intermediate support plate 119 parallel to the shaft 120 but at alocation clear of rotation of the transmission rotational member 140. Afree end of the shaft is formed into a handle 185 curving outwardly ofan axis defined by the control shaft, such that the human user mayoperate the arm by rotation of the handle about the axis of the controlshaft.

The arm 182 is elongated transversely of the control shaft and is formedin two pieces. A first base piece 182A forming the base of the arm isattached to the spacer plate 186 by a fastener 187 passing through aslot in the first base piece. The arm may thus be adjusted angularly ofthe spacer plate so as to tune pivotal positioning of the arm when thecontrol shaft 184 is rotated. The first base piece may also beadjustable in a direction in which the arm 182 is elongated such that areach of the arm in its pivotal positioning may be tuned in thisdirection.

A second piece 182B of the arm is connected to the first base piece by aguide element 189 received in a second slot portion of the first basepiece in transverse orientation thereto. The second piece may beadjustable (i) angularly of the first base piece about an axis definedby the guide element 189, and (ii) in the direction in which the arm iselongated.

Note that the second slot portion may be the same slot as that receivingthe fastener 187 or may form a separate slot thereof.

The second piece 182B of the arm forms a plate with a free end 1821 ofthe second piece inclined upwardly out of a main portion of the arm. Themain portion of the arm is formed by the first piece 182A and a portionof the second piece 182B which is located intermediately of the inclinedend 1821 and the spacer plate 186.

When moved into the disabling position, the arm's inclined end 1821 actsto lift the motor brake out of its normal operating position, therebydisabling same.

Additionally, an upper arm 190 supporting a cam 192 at its free end isfixedly attached to the control shaft 184 at a location above theintermediate support plate 119 but below the handle 185 of the controlshaft. This second arm 190 thus moves with rotation of the control shaftsuch that the cam 192 is moved into a position where it may contact thebelt 150 as the rotation of the control shaft concurrently moves thebrake disabling arm 182 into the disabling position. The cam 192 may berotated to present one of a plurality of different surface fortensioning the belt 150 to a proper degree of tension.

The cam 192 is carried on a separate plate 190B which is connected by anupstanding pin to another plate 190A thereabove that is directlyattached to the control shaft 184. These two plates 190A, 190Bcollectively form the second arm 190. The upstanding pin is thus seatedin the plate 190A such that the plate 190B is rotatable about the axisof the control shaft 184 with movement of the plate 190A.

A rotatable guide 200, similar in shape to the handle 185, is supportedon the intermediate support plate at a height inline with thebelt-receiving portion of the transmission rotational member so that theguide 200 may be set in spaced relation from the belt 150 and may beusable to retain the belt in the belt-receiving portion.

Additionally, a guide element 210 is provided on the bottom supportplace 1158 projecting inwardly towards the top support plate 115A suchthat the guide element may act as a stop to prevent collision of the arm182 with the body 110 at the mounting portion.

Moreover, a cover 220 may be provided in a manner covering thetransmission rotational member 140 and at least a portion of each of thebelt 150 and the external rotational member 9 so as to protect the humanuser under operation of the manual drive 100.

We now turn to use of the manual drive 100 in cooperation with the motor1.

With the manual drive 100 mounted to the frame 12 as described earlierbut not yet positioned so as to override regular operation of the motor1, the control shaft 184 is rotated by the human user so as to put therelease arm 182 in the disabling position, thereby disabling the motorbrake. As the release arm 182 is positioned in the disabling position,the upper arm 190 with the cam 192 thereon is moved into engagement withthe belt 150 which is arranged in its loop over the transmissionrotational member 140 and the external rotational member 9 of the motor,thereby sufficiently tensioning the belt so that the rotational movementof the transmission rotational member is transferable to the externalrotational member.

Using the hand power drill (schematically shown) in the illustratedarrangement, the socket of the drill 300 is inserted onto the drive head122 and the hand drill is set to operate in the same direction as thefirst rotational direction R1.

Driving the drive shaft 120 with the hand drill acts to shift thetransmission rotational member 140 axially upwardly along the shafttowards the head 122 as the threading on the shaft in cooperation withthe threading of the bore on the transmission rotational member forcesthe transmission rotational member to shift along the shaft in thisdirection. Such translational movement of the rotational member 140along the shaft occurs until the free end 125B of the first projectingelement engages the second projecting element 126, where thetransmission rotational member is in the driving position. Therotational movement of the shaft 120 then effects the rotationalmovement of the transmission rotational member 140 in the firstrotational direction R1.

The transmission rotational member in the driving position rotates atthe same speed as the shaft 120. In the event that rotational movementof the drive shaft 120 is slowed down or that the transmissionrotational member begins to rotate more quickly than the shaft at itscontrolled speed, for example in an over-speed condition due toimbalance in weights of the pans, the threading acts to shift thetransmission rotational member axially along the shaft towards thebraking surface 119A in order to slow down the transmission rotationalmember. If rotational movement of the shaft is halted, then the brakingsurface 119A acts to halt rotational movement of the transmissionrotational member as it wants to continue shifting axially down theshaft but is stopped from doing so by the fixed location of the brakingsurface 119A. It will be appreciated that braking occurs by contact ofmetal surfaces—that is, metal-to-metal contact of the bottom face of theratchet cog 161 which is metal and the braking surface of theintermediate support plate which is also metal in the illustratedarrangement.

In the event that the loading of the pans tends to rotate the main shaftof the motor in the second rotational direction R2, the ratchet 160provides braking in the second rotational direction R2 so as to preventrotational movement of the transmission rotational member in thisdirection.

Similarly, when the manual drive is actively coupled to the motor so asto be controlling same but is not being driven by the external agent,loading of the pans may tend to rotate the motor's main shaft in thefirst rotational direction but the manual drive is arranged to preventthis by engagement of the transmission rotational member with thebraking surface 119A.

Additionally, it will be appreciated that in the illustrated arrangementthe bore is threaded along its full axial length from a top face to abottom face of the transmission rotational member. Also in theillustrated arrangement, the shaft is threaded for an entirety of thatportion of its axial length which is located between the drive head 122and a top of the shaft housing 130.

In another arrangement of the present invention, the shaft includes afirst portion which is threaded and a second portion alongside thethreaded first portion which is smooth, and the transmission rotationalmember has a bore receiving the shaft that has an inner surface which isat least partly threaded for threadably engaging the threaded firstportion of the shaft. Thus, in this arrangement the transmissionrotational member in the driving position may rotate about the smoothsecond portion while also overlapping the threaded first portion wherepartial threading of the bore remains threadably engaged with theshaft's first portion.

Thus, it will be appreciated that in some arrangements of the presentinvention the shaft may not be threaded for an entirety of that portionof its axial length which is between the drive head and the intermediatesupport plate.

Since various modifications can be made in my invention as herein abovedescribed, and many apparently widely different embodiments of samemade, it is intended that all matter contained in the accompanyingspecification shall be interpreted as illustrative only and not in alimiting sense.

The invention claimed is:
 1. A manual drive for a motor with an externalrotational member coupled to a main shaft of the motor, the manual drivecomprising: a body; a mounting arrangement defined by the body formounting adjacent the motor in proximity to the external rotationalmember thereof; a shaft supported by the body for rotational movement; atransmission rotational member carried on the shaft for rotationalmovement about an axis defined by the shaft such that the transmissionrotational member is arranged for operatively coupling to the externalrotational member of the motor where the rotational movement of thetransmission rotational member is operable to drive the motor via itsexternal rotational member; a driving member carried on the shaft at alocation adjacent the transmission rotational member so as to bearranged for effecting the rotational movement of the transmissionrotational member in a first rotational direction by rotational movementof the driving member in the first rotational direction; a brakingmember arranged for braking rotational movement of the transmissionrotational member; the transmission rotational member being movableaxially along the shaft between a driving position at one location alongthe shaft where the transmission rotational member is rotatable incooperation with the driving member so as to drive the motor and abraking position at a different location along the shaft where thetransmission rotational member is in engagement with the braking memberfor braking the motor.
 2. The manual drive according to claim 1 whereinthe driving member and the braking member are disposed on opposite sidesof the transmission rotational member such that the transmissionrotational member is movable axially along the shaft therebetween. 3.The manual drive according to claim 1 wherein the driving membercomprises a first projecting element protruding radially of the shaftthat is operable to engage a cooperative second projecting element onthe transmission rotational member that is located at a radially spacedposition of the shaft.
 4. The manual drive according to claim 1 whereinthe braking member comprises a surface carried by the body that isarranged to engage a face of the transmission rotational member facingaxially in a direction along the shaft.
 5. The manual drive according toclaim 1 wherein the shaft is threaded and the transmission rotationalmember has a bore receiving the shaft that has an inner surface which isthreaded for threadably engaging the threaded shaft.
 6. The manual driveaccording to claim 5 wherein the shaft is threaded in a manner so as tobe arranged to draw the transmission rotational member rotating in thefirst rotational direction along the shaft towards the braking member.7. The manual drive according to claim 1 wherein the transmissionrotational member in its rotational movement is rotatable relative tothe shaft such that the transmission rotational member and the shaft arerotatable in the first rotational direction at the same or differentspeeds.
 8. The manual drive according to claim 1 wherein thetransmission rotational member includes a ratchet arranged to resistrotational movement of the transmission rotational member in an oppositesecond rotational direction.
 9. The manual drive according to claim 1wherein the transmission rotational member forms a pulley.
 10. Themanual drive according to claim 1 wherein a free end of the shaft isshaped for cooperation with a socket of a hand drill.
 11. The manualdrive according to claim 1 wherein there is provided a motor brakerelease mechanism that is arranged to disable a brake of the motor suchthat the motor is controllable by the manual drive.
 12. The manual driveaccording to claim 11 wherein the motor brake release mechanismcomprises an arm with an inclined end which is operable to engage thebrake of the motor in a manner whereby the brake is disabled.
 13. Amanual drive for a motor with an external rotational member coupled to amain shaft of the motor, the manual drive comprising: a body; a mountingarrangement defined by the body for mounting adjacent the motor inproximity to the external rotational member thereof; a shaft supportedby the body for rotational movement; a transmission rotational membercarried on the shaft for rotational movement about an axis defined bythe shaft such that the transmission rotational member is arranged foroperatively coupling to the external rotational member of the motorwhere the rotational movement of the transmission rotational member isoperable to drive the motor via its external rotational member; adriving member carried on the shaft at a location adjacent thetransmission rotational member so as to be arranged for effecting therotational movement of the transmission rotational member in a firstrotational direction by rotational movement of the driving member in thefirst rotational direction; a braking member arranged for brakingrotational movement of the transmission rotational member; thetransmission rotational member having a bore receiving the shaft thathas an inner surface which is at least partly threaded; the shaft havinga threaded portion along at least a portion of its axial length that isthreaded in a manner so as to be arranged to draw the transmissionrotational member rotating in the first rotational direction along theshaft towards a first portion of the braking member by threadableengagement with the transmission rotational member such that the firstportion of the braking member is operable for braking the transmissionrotational member rotating in the first rotational direction; and asecond portion of the braking member arranged for braking thetransmission rotational member rotating in an opposite second rotationaldirection.
 14. The manual drive according to claim 13 wherein the firstportion of the braking member comprises a surface carried by the bodyoriented in a radial plane of the shaft so as to be arranged to engage aface of the transmission rotational member facing axially along theshaft.
 15. The manual drive according to claim 14 wherein the surface isarranged at a fixed location such that the transmission rotationalmember is movable axially along the shaft towards the fixed surface. 16.The manual drive according to claim 13 wherein the second portion of thebraking member forms a ratchet arranged to resist rotational movement ofthe transmission rotational member in the second rotational direction.17. The manual drive according to claim 16 wherein a part of the ratchetis unitary with the transmission rotational member so as to be rotatabletherewith.
 18. The manual drive according to claim 17 wherein the partof the ratchet unitary with the transmission rotational member includesa face facing axially along the shaft that is arranged to engage thefirst portion of the braking member when braking in the first rotationaldirection.